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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Korean Society of Civil Engeneers
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Volume & Issues
Volume 36, Issue 4 - Aug 2016
Volume 36, Issue 3 - Jun 2016
Volume 36, Issue 2 - Apr 2016
Volume 36, Issue 1 - Feb 2016
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A Study on Compressive Strength Estimation of Underwater Concrete Structures According to Water Depths
Lee, Jisung ; Han, Sanghun ; Park, Seunghee ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 341~348
DOI : 10.12652/Ksce.2016.36.3.0341
Harbor facilities require long-term durability and safety, and also maintain the performance requirement until the durability life. However, existing harbor facilities are becoming superannuated with durable years and durability is declined by erosion of the sea and damage from sea. In addition, harbor facilities will be in demand for the expansion of harbor and offshore structures with rising economic power by enhancement of domestic industry and increase of import and export. Therefore, in this study, two kinds of nondestructive test (NDT) techniques (schmidt rebound hammer and ultrasonic sensor) are verified for the effective maintenance of underwater concrete structures including harbor facilities. Sea field applicability of Schmidt hammer and ultrasonic sensor was verified by comparing field test result with sea field test result and also deduced the compressive strength estimation equation by depth of the water. On the basis of the sea field test result, compressive strength estimation equation which was deduced by multiple regression analysis indicated highest accuracy compared to other equations, especially it will be more likely to be used in underwater because of the depth of water correction. In the future, if schmidt hammer and ultrasonic sensor which were invented as waterproofing are used with ROV (Remotely Operated Vehicle), it will be possible to make a diagnosis of high reliability for underwater concrete structures and set up a ubiquitous concept of NDT system.
A Study on Buffeting Responses of a In-service Steel Cable-stayed Bridge Using Full-scale Measurements
Lee, Deok Keun ; Kong, Min Joon ; You, Dong Woo ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 349~359
DOI : 10.12652/Ksce.2016.36.3.0349
In order to analytically evaluate buffeting responses, the analysis of wind characteristics such as turbulence intensity, turbulence length, gust, roughness coefficient, etc must be a priority. Static aerodynamic force coefficients, flutter coefficients, structural damping ratios, aerodynamic damping ratios and natural frequencies affect the analytical responses. The bridge interested in this paper has being been used for 32 years. As the time passes, current terrain conditions around the bridge are different markedly from the conditions it was built 32 years ago. Also, wind environments were considerably varied by the climate change. For this reason, it is necessary to evaluate the turbulence intensity, length, spectrum and roughness coefficient of the bridge site from full-scale measurements using the structural health monitoring system. The evaluation results indicate that wind characteristics of bridge site is analogous to that of open terrain although the bridge is located on the coastal area. To calculate buffeting responses, the analysis variables such as damping ratios, static aerodynamic force coefficients and natural frequency were evaluated from measured data. The analysis was performed with regard to 4 cases. The evaluated variables from measured data are applied to the first and second analysis cases. And the other analysis cases were performed based on Design Guidelines for Steel Cable Supported Bridges. The calculated responses of each analysis cases are compared with the buffeting response measured at less than 25m/s wind speed. It is verified that the responses by the numerical analysis applying the estimated variables based on full-scale measurements are well agreed with the measured actual buffeting responses under wind speed 25m/s. Also, the extreme wind speed corresponding to a recurrence interval 200 years is derived from Gumbel distribution. The derived wind speed for return period of 200 years is 45m/s. Therefore the buffeting responses at wind speed 45m/s is determined by the analysis applying the estimated variables.
Finite Element Analysis of Lead Rubber Bearing by Using Strain Energy Function of Hyper-Elastic Material
Cho, Sung Gook ; Park, Woong Ki ; Yun, Sung Min ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 361~374
DOI : 10.12652/Ksce.2016.36.3.0361
The material property of the rubber has been studied in order to improve the reliability of the finite element model of a lead rubber bearing (LRB) which is a typical base isolator. Rubber exhibits elastic behaviour even within the large strain range, unlike the general structural material, and has a hyper-elastic characteristics that shows non-linear relationship between load and deformation. This study represents the mechanical characteristics of the rubber by strain energy function in order to develop a finite element (FE) model of LRB. For the study, several strain energy functions were selected and mechanical properties of the rubber were estimated with the energy functions. A finite element model of LRB has been developed by using material properties of rubber and lead which were identified by stress tests. This study estimated the horizontal and vertical force-displacement relationship with the FE model. The adequacy of the FE model was validated by comparing the analytical results with the experimental data.
A Study on the Design Bending Moments of Long Span Decks with KL-510 Load
Chung, Chulhun ; Lee, Hanjoo ; Joo, Sanghoon ; An, Hohyun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 375~384
DOI : 10.12652/Ksce.2016.36.3.0375
In the current Korea highway bridge design code (KHBDC), the criteria of concrete bridge decks are mainly based on short span decks of steel plate girder bridge, there are very little the specific criteria of long span decks in the twin steel plate girder bridge. Therefore, to put more rational and practical design criteria of the long span decks on the code, the complements of the related criteria are required in the current design code. This paper proposed the design bending moments of decks with 6.0~12.0m span for KL-510 load in direction to bridge (longitudinal direction) and perpendicular direction to bridge (transverse direction). The effects of orthotropic concrete decks, stiffness of steel girders and multiple lane loading factors (MLLF) were reflected in the design bending moments. The proposed design bending moments were compared to the design bending moments with DB-24 load.
Development of Urban Flood Risk Index for the Cheonggyecheon Watershed Using SWMM
Yang, Jeong-Seok ; Kim, Il-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 385~393
DOI : 10.12652/Ksce.2016.36.3.0385
In this study, we analyzed th Cheonggyecheon watershed for urban flood risk index. SWMM model configuration based on each watershed data. And it was set as the final index calculated indicators related to the humanities, social and environmental. Each indicator was standardized and weighted using the Delphi method. Finally, select the danger area through urban flood risk index. Determined 12 indices according to the hazard and vulnerability. Vulnerability is selected the index divided by three factors. 21 watersheds were analyzed through urban flood risk index. The top of three areas of index is Jeongneung 1, Majang, Pil-dong, each index is 0.533, 0.494, 0.381. The lowest index is soongin 0.216. Urban flood risk index developed in this study can be applied to other regions in Korea for establishing national water resources management plan.
A Study on Urban Inundation Prediction Using Urban Runoff Model and Flood Inundation Model
Tak, Yong Hun ; Kim, Jae Dong ; Kim, Young Do ; Kang, Boosik ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 395~406
DOI : 10.12652/Ksce.2016.36.3.0395
Population and development are concentrated by urbanization. Consequently, the usage of underground area and the riverside area have been increased. By increasing impermeable layer, the urban basin drainage is depending on level of sewer. Flood damage is occurred by shortage of sewer capacity and poor interior drainage at river stage. Many of researches about flood stress the unavailability of connection at the river stage with the internal inundation organically. In this study, flood calculated considering rainfall and combined inland-river. Also, using urban runoff model analyze the overflow of sewer. By using results of SWMM model, using flood inundation analysis model analyzed internal drainage efficiency of drainage system. Applying SWMM model, which results to flood inundation analysis model, analyzes internal drainage efficiency of drainage system under localized heavy rain in a basin of the city. The results of SWMM model show the smoothness of internal drainage can be impossible to achieve because of the influence of the river level and sewer overflow appearing. The main manholes were selected as the manhole of a lot of overflow volume. Overflow reduction scenarios were selected for expansion of sewer conduit and instruction retention pond. Overflow volume reduces to 45% and 33~64% by retention pond instruction and sewer conduit expansion. In addition, the results of simulating of flood inundation analysis model show the flood occurrence by road runoff moving along the road slope. Flooded area reduces to 19.6%, 60.5% in sewer conduit expansion scenarios.
Development of Regional Regression Model for Estimating Mean Low Flow in Ungauged Basins
Lee, Tae Hee ; Lee, Min Ho ; Yi, Jaeeung ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 407~416
DOI : 10.12652/Ksce.2016.36.3.0407
The purpose of this study is to develop regional regression models to estimate mean low flow for ungauged basins. The unregulated streamflow data observed at 12 multipurpose dams and 4 irrigation dams were analyzed for determining mean low flows. Various types of regression models were developed using the relationship between mean low flows and various sets of watershed characteristics such as drainage area, average slope, drainage density, mean annual precipitation, runoff curve number. The performance of each regression model for estimating mean low flows was assessed by comparison with the results obtained from the observed data. It was found that a regional regression model explained by drainage area, the mean annual precipitation, and runoff curve number showed the best performance. The regression model presented in this study also gives better estimates of mean low flow than the estimates by the drainage-area ratio method and the previous regression model.
Modification of Surface Flow Analysis Algorithm in SWAT
Lee, Jeongwoo ; Kim, Nam Won ; Lee, Jeong Eun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 417~426
DOI : 10.12652/Ksce.2016.36.3.0417
SWAT model usually underestimates daily peak discharges. To resolve this problem, in this study, the algorithm related with the surface flow simulation was modified by partitioning excessive infiltration based on the relative length between overland flow time of concentration and percolation travel time in soil water zone and by computing time of concentration varying with the amount of surface flow. The modified SWAT was applied to the Chungju dam watershed to assess the increasing effects of daily peak discharges. The daily peaks simulated by the modified SWAT were on average 10% higher than those by original SWAT for the peaks above
. The modified SWAT was found to be able to more accurately reproduce daily peaks, particularly showing increase rates of 9.9%, 18.6% and 12.6%, respectively, for top three peaks that occurred in the years of 1990, 2002, and 2006.
Development of Regional Regression Model for Estimating Flow Duration Curves in Ungauged Basins
Lee, Tae Hee ; Lee, Min Ho ; Yi, Jaeeung ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 427~437
DOI : 10.12652/Ksce.2016.36.3.0427
The objective of this study is to develop the regional regression models based on the physiographical and climatological characteristics for estimating flow duration curve (FDC) in ungauged bsisns. To this end, the lower sections with duration from 185 to 355 days of FDCs were constructed from the 16 gauged streamflow data, which were fitted to the two-parameter logarithmic type regression equation. Then, the parameters of the equation were regionalized using the basin characteristics such as basin area, basin slope, drainage density, mean annual precipitation, mean annual streamflow, runoff curve number in order that the proposed regression model can be used for ungauged basin. From the comparison of the estimated by the regional regression model with the observed ones, the model with the combination of basin area, runoff curve number, mean annual precipitation showed the best performance.
Estimation of Synthetic Unit Hydrograph by Cluster Analysis Using Geomorphic Characteristics of Mid-size Watershed
Kim, Jin Gyeom ; Kim, Jong min ; Kang, Boosik ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 439~449
DOI : 10.12652/Ksce.2016.36.3.0439
The methodology of synthetic unit hydrograph using geomorphic characteristics was suggested. Six geomorphic components over 19 watersheds were used to estimate synthetic unit hydrograph and the test watersheds were classified into two groups on the basis of the area of
. The regression formulas between standardized geomorphic characteristics for each group and peak quantities of specific streamflow and time of representative unit hydrograph were suggested and the Nash and the Clark unit hydrographs were derived. For verifying the derived unit hydrographs, the resulting hydrographs were compared with the ones using the existing Clark unit hydrographs based on the empirical parameter estimation for the 145 storm events during 2010 to 2011 for the additional six watersheds. The results showed the relatively higher performance over the existing synthetic unit hydrograph methods, which could be a contribution to the hydrologic estimation in ungauged watersheds.
Seismic Failure Probability of the Korean Disaster Risk Fill Dams Estimated by Considering Freeboard Only
Ha, Ik Soo ; Lee, Soo Gwun ; Lim, Jeong Yeul ; Jung, Young Hoon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 451~461
DOI : 10.12652/Ksce.2016.36.3.0451
The objective of this study is to illustrate the methods and procedures for estimating the failure probability of small fill dams subjected to earthquake events and to estimate the seismic failure probability of the Korean disaster risk fill dams where geotechnical information is not available. In this study, first of all, seismic failure probabilities of 7 disaster risk small fill dams, where geotechnical information is available, were evaluated using event tree analysis. Also, the methods and procedures for evaluating probabilities are illustrated. The relationship between dam height and freeboard for 84 disaster risk small dams, for which the safety diagnosis reports are available, was examined. This relationship was associated with the failure computation equation contained in the toolbox of US Army corps of engineers. From this association, the dam height-freeborard critical curve, which represents `zero` failure probability, was derived. The seismic failure probability of the Korean disaster risk fill dams was estimated using the critical curve and the failure probabilities computed for 7 small dams.
Vane Shear Test on Nakdong River Sand
Park, Sung-Sik ; Zhou, An ; Kim, Dong-Rak ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 463~470
DOI : 10.12652/Ksce.2016.36.3.0463
A vane shear test (VST) is a simple testing method for determining an undrained shear strength of cohesive soils by minimizing soil disturbance. In this study, the VST was used to determine a shear strength of sand. Dry Nakdong River sand was prepared for loose and dense conditions in a cell and then pressurized with 25, 50, 75 or 100 kPa from the surface of sand. A vane (5 cm in diameter and 10 cm in height) was rotated and a torque was measured within sand. When a torque moment by vane and friction resistance moment by sand is assumed to be equalized, a friction angle can be obtained. When a vane rotates within clay, a uniform undrained shear strength is assumed to be acting on cylindrical failure surface. On the other hand, when it is applied for sand, the failure shape can be assumed to be an octagonal or square column. The relationship between measured torque and resistant force along assumed failure shapes due to friction of sand was derived and the internal friction angle of sand was determined for loose and dense conditions. For the same soil condition, a series of direct shear test was carried out and compared with VST result. The friction angle from VST was between 24-42 degrees for loose sand and 33-53 degrees for dense sand. This is similar to those of direct shear tests.
Evaluation of the Effect of Initial Condition of the Granular Assembly on the Bearing Capacity of the Shallow Foundation using Photoelastic Measurement Technique
Shin, Sang-Young ; Jung, Young-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 471~491
DOI : 10.12652/Ksce.2016.36.3.0471
Traditional limit equilibrium method needs an assumption of the failure surface to calculate the bearing capapcity of the shallow foundation. From the viewpoint of the mechanics of granular materials, however, the failure of the soil mass is initated by the local buckling of the contact force chains. In this study we observed the directional distribution of the contact force chains in the granular assembly stacked by model particles subjected to the model shallow foundation during loading. Two sets of the assemblies with a regular structure and initially local imperfection were prepared for tests. Existence of the initial local imperfection has a significant effect on the directional distribution of the contact force chains. The bearing capacity of the assembly with local imperfection is only 67% the capacity of the assembly with the regular structure.
Utilization of Induced Polarization and Electrical Resistivity for Identifying Rock Condition
Park, Jinho ; Ryu, Jinwoo ; Jung, Jeehee ; Lee, In-Mo ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 493~502
DOI : 10.12652/Ksce.2016.36.3.0493
This study examines how rock condition affects the variation of the chargeability and electrical resistivity of the rock. In the theoretical study, the relationship correlating chargeability with the variables affecting it is derived. A parametric study utilizing the derived relationship reveals that the size of narrow pores (
) is the most influential factor on chargeability, and the salinity of pore water (
) is the second. In the laboratory experiments, small scale rock fracturing zone is modelled using sand stone. Chargeability and resistivity are measured by changing the size of the joint aperture, the location of fractured zone and the existence of clay gouge and/or clay layer which shows lower chargeability than the sand stone layer in the multi-layered ground. Test results show that chargeability is controlled not by the rock fracturing condition but by the size of narrow pore (
) where each line of current flow passes through. Also, the chargeability decreases with increase of the pore water salinity (
). In conclusion, the ground condition can be identified more efficiently by measuring the induced polarization along with the electrical resistivity; identifying the existence of sea water, the layered ground and/or the fractured rock becomes more reliable.
A Study on Risk Analysis and Countermeasures for Urban Railway Casuality Accident
Kim, Jin Tae ; Kim, Si Gon ; Oh, Jae Kyoung ; Go, Seung-ryul ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 503~510
DOI : 10.12652/Ksce.2016.36.3.0503
The paper suggests to measure the risk of pedestrians inside urban railway stations. The level of risk is calculated in manner of both an average risk and average weighted risk of 9 different facility inside urban railway stations. Based on these level of risk, top 10 stations are chosen out of all the stations operated by Seoul Metro and Seoul Metropolitan Rapid Transit Cooperation (SMRT). In order to alleviate the level of risk, countermeasures for those risks are surveyed for 60 experts who are now involved in safety issues in those 2 railway operation companies. A countermeasure survey for the accidents is done into 2 ways. One is to lower the probability of making accidents and the other is to alleviate the consequence for accidents. The effectiveness of those alternatives is surveyed between 1 to 5 yardsticks and converted into one value for each alternative.
Trans-Korea Rail Logistics Strategy for the Normalization of South and North Korea Economic Cooperation
Kim, Jeong Hyun ; Kim, Gang Seog ; Kim, Yong Jin ; Yu, Jeong Whon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 511~520
DOI : 10.12652/Ksce.2016.36.3.0511
It is essential to connect the railroads between South and North Korea in order to the implementation of the Eurasia initiatives and prepare for the normalization of the economic cooperation between south and north Korea as well as the unification. This study provides the strategy to establish the rail logistics network for the normalized trades between south and north Korea, and the accommodation of the logistics demands to China and Russia. The alternative routes were designated and the costs for the rehabilitation were estimated, and suggested the priority for the investment. The Trans-China Rail is prior to the Trans-Siberia Rail in terms of the utility for the logistics and the political value. In connection to the TSR, it is desirable to pass the Seoul-Gyeonggi area where the demand is greater than the other area. This route is limited by the restriction in the capacity, then the Gyeonggi Ring Rail route may be necessary.
Prediction of Divided Traffic Demands Based on Knowledge Discovery at Expressway Toll Plaza
Ahn, Byeong-Tak ; Yoon, Byoung-Jo ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 521~528
DOI : 10.12652/Ksce.2016.36.3.0521
The tollbooths of a main motorway toll plaza are usually operated proactively responding to the variations of traffic demands of two-type vehicles, i.e. cars and the other (heavy) vehicles, respectively. In this vein, it is one of key elements to forecast accurate traffic volumes for the two vehicle types in advanced tollgate operation. Unfortunately, it is not easy for existing univariate short-term prediction techniques to simultaneously generate the two-vehicle-type traffic demands in literature. These practical and academic backgrounds make it one of attractive research topics in Intelligent Transportation System (ITS) forecasting area to forecast the future traffic volumes of the two-type vehicles at an acceptable level of accuracy. In order to address the shortcomings of univariate short-term prediction techniques, a Multiple In-and-Out (MIO) forecasting model to simultaneously generate the two-type traffic volumes is introduced in this article. The MIO model based on a non-parametric approach is devised under the on-line access conditions of large-scale historical data. In a feasible test with actual data, the proposed model outperformed Kalman filtering, one of a widely-used univariate models, in terms of prediction accuracy in spite of multivariate prediction scheme.
Risk Management for Casuality Accident at Urban Railway Stations
Kim, Jin Tae ; Kim, Si Gon ; Kim, Yeon Kyu ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 529~534
DOI : 10.12652/Ksce.2016.36.3.0529
The paper suggests risk management methodology for alleviating casuality accidents at urban railway stations. Risk management deals with countermeasures for reducing accident probability or consequences to reach at the certain level of risk. First of all, Economic evaluations using cost and benefit for all the alternatives are performed. The alternatives exceeding B/C ratio greater than 1, each alternative is applied in the order of higher B/C ratio. this process is repeated when the level of risk is reduced as low as reasonably practical (ALARP). In order to determine the level of ALARP, Level of Service (LOS) for casuality risk at urban railway stations is proposed. The ALARP level is set to the LOS "C". Finally, a case study is applied to the Jongno 3-ga station, which is a highest risky station among all the stations operated by Seoul Metro and Seoul Metropolitan Rapid Transit Cooperation (SMRT).
A Study on CBR Characteristics of National Highway in Yeongnam Region
Park, Yeong-Mog ; Lee, Go-Hyeun ; Kim, Nak-Seok ; Cho, Gyu-Tae ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 535~543
DOI : 10.12652/Ksce.2016.36.3.0535
This study has been carried out to evaluate the CBR characteristics and the correlations among every soil properties of National road in Yeongnam region. Total of 480 soil samples were collected from 41 administrative districts for more than 30 years. Their physical and mechanical properties such as natural water content, the Atterberg limit, No. 200 sieve passing, the compaction test and the CBR test results were involved. The soils in Yeongnam region, SM, SC, SP and CL by USCS have predominated approximately 79%. The test results show that average CBR values of gravel and sand range from 12.7% to 20.3% and those of silt and clay range from 4.8% to 7.1%. It means that average CBR values of fine grained soils are less than a half of coarse grained one. Natural water content, No. 200 sieve passing, optimum moisture content and maximum dry density of soils are well correlated with CBR values. Especially, it presents that No. 200 sieve passing is the best correlation factor with CBR value. If consider the partition off this region into 6 zones of classified by mother rock, the correlation between CBR value and every soil properties tends to increase. It is suggested that tables, figures and the regressions described in this paper may be available for designers and engineers to understand the characteristics of an embankment materials in Yeongnam region.
An Analysis of Pile Foundation Load Transfer for Lightweight Pavement System in Clay Soil using Lab Chamber Test
Lee, Kwan-Ho ; Shin, Kwang-Ho ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 545~550
DOI : 10.12652/Ksce.2016.36.3.0545
The main purpose of this study is to analyze and evaluate the feasibility of ligthweight pavement system with pile foundation on soft soil by laboratory small chamber test. In order to verify the stability of lightweight pavement system, the 1/30 scaled downed model system was tested at lab. The soft soil condition was simulated and group piles for skin friction resistance were used. Within the limited lab test, the settlements of pavement system were 0.86 mm for Case A, 0.70 mm for Case B, and 0.50 mm for Case C. The converted maximum settlement differential settlement were 25.8 mm and 10.8 mm. These values meet the inside of specification of Bridge Design Guide in Korea. The use of lightweight pavement systems on soft soils could be an alternative construction method on soft soils to reduce the challenges of conventional design and constructions.
Development of a Soil Distribution Method and Equipment Operation Models Using Worker`s Heuristics
Lim, So-Young ; Kim, Sung-Keun ; Ahn, Seo-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 551~564
DOI : 10.12652/Ksce.2016.36.3.0551
Earthworks are the fundamental steps in a construction job, and are mainly comprised of smaller tasks performed by construction machinery. The productivity of the construction job can be improved by optimizing excavation, filling, and other such operations. Earthworks involve a lot of mechanical work performed by the collaboration between various kinds of construction equipment, which in turn leads to higher fuel consumption. Actual earthworks depend mostly on the intuition and experience of the driver of the machines, thus leading to inefficiency and environmental problems caused by unnecessary emission of carbon, Recently automated and information-oriented technologies are consistently being researched towards the improvement of efficiency of earthworks in the construction industry. The present research involves the introduction and understanding of the decision-making elements of heuristics which can be applied to the earthwork planning. A method is also suggested for creating an effective work path for construction machine to perform task packages (TP) for cutting and filling processes. A simulation test is performed to verify the effectiveness of suggested methods in terms of space interference and total moving distance of construction equipment.
Productivity Analysis on Real-time Path Monitoring of Dumps
Lee, Hak June ; Kwon, Young Min ; Yoon, Cha Woong ; Seo, Jong Won ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 565~571
DOI : 10.12652/Ksce.2016.36.3.0565
This study check the construction site and borrow pit location using GIS-based Open Global Map. Construction Equipment (Dump, Grader) utilizes the GPS (Global Positioning System) to gain equipment`s real-time position, speed, altitude, using the data such as directions to perform real-time monitoring. The analysis of the productivity is completed through using the data, and the optimal number of equipment is calculated. It was found that the analysis results showed approximately 30% less cost compared to the actual design plan.
Development of a Fleet Management System for Cooperation Among Construction Equipment
Ahn, Seo-Hyun ; Kim, Sung-Keun ; Lee, Kwan-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 573~586
DOI : 10.12652/Ksce.2016.36.3.0573
In construction jobs, a combination of various kinds of machinery is used to perform earthworks at a large-scale site. Individual equipments essentially cooperate with each other on task such as excavation, load, transfer and compaction. While other area have studied cooperation system, related study in domestic construction is in poor condition. In this study, construction equipment fleet management system is developed for solving this problem and find way to improving efficiency in earthworks site. The entire concept of the fleet management system, including its components and process, has been systematically outlined in this paper. An operational methodology has also been suggested, where a number of machines, such as the excavators, trucks and compactors, are chosen and further grouped into a cluster. A case study verify fleet management system`s effectiveness on performing task package by comparing existing work method with methodology in this study. Fleet management system in this study is expected to curtail fuel consumption by the reduction of working time and moving distance. Furthermore, it can be anticipated to declining carbon emission effect.
Standard Manual Development for Infants and Children`s Urban Railway Accident Prevention
Kang, Soo-Hee ; Kwon, Young-Jong ; Kim, Yeon Kyu ; Go, Seung-ryul ;
Journal of The Korean Society of Civil Engineers, volume 36, issue 3, 2016, Pages 587~594
DOI : 10.12652/Ksce.2016.36.3.0587
Even though accidents occurred inside urban railway stations demage not only one person, but also surrounding people, it can be prevented by cautious actions. This research aims at infants and children, which can maximize the educational impacts, to develop a safety textbook which can educate safety rules and behavioral know-how to reduce the accidents occurred in urban railway stations, and at parents and teachers to gather opinions through surveys on the research`s future direction. This research conducts a case study and comparison analysis on domestic and foreign safety manuals, which is organized in a book form of fairy tales educating safety rules for readers to utilize the urban railway by steps from boarding to taking off. Through a survey we conducted for parents and teachers as providing the safety textbook developed through this research, we could get the positive evaluations and gather opinions on the future research direction. The safety textbook developed in a form of fairy tale book through this research is for infants and children to use the urban railway in a safe manner, which is expected to evoke the interests and curiosity and create the educational impacts on users.